Bug#464551: Here is the information
Before plugging in devices:
$ find /proc/bus/usb
/proc/bus/usb
/proc/bus/usb/004
/proc/bus/usb/004/001
/proc/bus/usb/003
/proc/bus/usb/003/002
/proc/bus/usb/003/001
/proc/bus/usb/002
/proc/bus/usb/002/001
/proc/bus/usb/001
/proc/bus/usb/001/005
/proc/bus/usb/001/004
/proc/bus/usb/001/001
/proc/bus/usb/devices
$ find /dev/bus/usb
/dev/bus/usb
/dev/bus/usb/004
/dev/bus/usb/004/001
/dev/bus/usb/002
/dev/bus/usb/002/001
/dev/bus/usb/003
/dev/bus/usb/003/002
/dev/bus/usb/003/001
/dev/bus/usb/001
/dev/bus/usb/001/005
/dev/bus/usb/001/004
/dev/bus/usb/001/001
After plugging in devices:
$ find /proc/bus/usb
/proc/bus/usb
/proc/bus/usb/004
/proc/bus/usb/004/005
/proc/bus/usb/004/001
/proc/bus/usb/003
/proc/bus/usb/003/002
/proc/bus/usb/003/001
/proc/bus/usb/002
/proc/bus/usb/002/002
/proc/bus/usb/002/001
/proc/bus/usb/001
/proc/bus/usb/001/005
/proc/bus/usb/001/004
/proc/bus/usb/001/001
/proc/bus/usb/devices
$ find /dev/bus/usb
/dev/bus/usb
/dev/bus/usb/004
/dev/bus/usb/004/005
/dev/bus/usb/004/001
/dev/bus/usb/002
/dev/bus/usb/002/002
/dev/bus/usb/002/001
/dev/bus/usb/003
/dev/bus/usb/003/002
/dev/bus/usb/003/001
/dev/bus/usb/001
/dev/bus/usb/001/005
/dev/bus/usb/001/004
/dev/bus/usb/001/001
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